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Title: In situ investigations of laser and thermally modified As{sub 2}S{sub 3} nanolayers: Synchrotron radiation photoelectron spectroscopy and density functional theory calculations

As-deposited, annealed, and in situ As{sub 2}S{sub 3} nanolayers, illuminated by blue (405 nm) and red (650 nm) laser light, were studied using synchrotron radiation photoelectron spectroscopy and DFT electronic structure calculations. Changes in composition and local atomic coordination occurring in the irradiated region of As{sub 2}S{sub 3} films were monitored by analysis of As 3d and S 2p core levels. These studies show that both the thermal treatment and the red laser illumination of As{sub 2}S{sub 3} nanolayers decrease the concentration of homopolar (As-As and S-S) bonds. From the other hand, an increasing concentration of As-rich structural units (s.u.) with a homopolar As-As bond was observed under in situ blue laser illumination of As{sub 2}S{sub 3} nanolayers. Molecular orbital energies were calculated for different As- and S-centered s.u. and used for the interpretation of the core levels and valence band spectra. The surface local structure of the As{sub 2}S{sub 3} nanolayers and its photoinduced transformation are discussed in detail.
Authors:
; ; ;  [1] ;  [2] ;  [3] ;  [4] ; ;  [5] ;  [6] ;  [7] ;  [8]
  1. Institute of Solid State Physics and Chemistry, Uzhhorod National University, Pidhirna Str., 46, 88000 Uzhhorod (Ukraine)
  2. Wigner Research Centre for Physics, Hungarian Academy of Sciences, 1121 Budapest (Hungary)
  3. Institute for Nuclear Research, Hungarian Academy of Sciences, H-4001 Debrecen (Hungary)
  4. Pavol Jozef Šafárik University in Košice, Park Angelinum 9, Košice (Slovakia)
  5. Department of Surface and Plasma Science, Faculty of Mathematics and Physics, Charles University, V Holešovičkách 2, 18000 Prague 8 (Czech Republic)
  6. Institute of Physics, Academy of Science of the Czech Republic, Na Slovance 2, CZ-182 21 Prague 8 (Czech Republic)
  7. Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14, km 163.5, in Area Science Park, 34149 Basovizza, Trieste (Italy)
  8. (Italy)
Publication Date:
OSTI Identifier:
22493038
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 118; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANNEALING; ARSENIC SULFIDES; CONCENTRATION RATIO; DENSITY FUNCTIONAL METHOD; ELECTRONIC STRUCTURE; LASER RADIATION; MOLECULAR ORBITAL METHOD; NANOSTRUCTURES; P STATES; PHOTOELECTRON SPECTROSCOPY; S STATES; SPECTRA; SYNCHROTRON RADIATION; THIN FILMS; VALENCE; VISIBLE RADIATION